

Read the file, "pcr.csv" into a data.frame object.

1. Try to reproduce the example figure, "scatter.pdf" using read.csv, plot, subset, abline

create variations on the color and type of markers (using col, pch) and of the vertical line (col, lty, etc).

2. Try to reproduce "boxplot.pdf" using factor, tapply, quartz and boxplot


what do the boxplots signify about the distribution of the data (i.e., what  do the whiskers, circles, boxes and thick line represent)?